The following commit has been merged in the master branch: commit ac16d1484efd5d2d9077c55453b1f8abff49fc18 Author: Matthias Schiffer mschiffer@universe-factory.net Date: Tue May 28 17:32:32 2013 +0200

batman-adv: wait for rtnl in batadv_store_mesh_iface instead of failing if it is taken

The rtnl_lock in batadv_store_mesh_iface has been converted to a rtnl_trylock some time ago to avoid a possible deadlock between rtnl and s_active on removal of the sysfs nodes.

The behaviour introduced by that was quite confusing as it could lead to the sysfs store to fail, making batman-adv setup scripts unreliable. As recently the sysfs removal was postponed to a worker not running with the rtnl taken, the deadlock can't occur any more and it is safe to change the trylock back to a lock to make the sysfs store reliable again.

Signed-off-by: Matthias Schiffer mschiffer@universe-factory.net Reviewed-by: Simon Wunderlich siwu@hrz.tu-chemnitz.de Signed-off-by: Marek Lindner lindner_marek@yahoo.de Signed-off-by: Antonio Quartulli ordex@autistici.org

diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index 15a22ef..929e304 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -582,10 +582,7 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj, (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0)) goto out;

- if (!rtnl_trylock()) { - ret = -ERESTARTSYS; - goto out; - } + rtnl_lock();

if (status_tmp == BATADV_IF_NOT_IN_USE) { batadv_hardif_disable_interface(hard_iface,